{"id":51231,"date":"2026-07-31T15:22:11","date_gmt":"2026-07-31T15:22:11","guid":{"rendered":"https:\/\/cryptd.in\/coldcard-wallet-flaw-exposes-years-of-bitcoin-seeds-after-70m-in-btc-stolen\/"},"modified":"2026-07-31T15:22:11","modified_gmt":"2026-07-31T15:22:11","slug":"coldcard-wallet-flaw-exposes-years-of-bitcoin-seeds-after-70m-in-btc-stolen","status":"publish","type":"post","link":"https:\/\/cryptd.in\/hu\/coldcard-wallet-flaw-exposes-years-of-bitcoin-seeds-after-70m-in-btc-stolen\/","title":{"rendered":"Coldcard Wallet Flaw Exposes Years of Bitcoin Seeds After $70M in BTC Stolen"},"content":{"rendered":"<p><a rel=\"nofollow\" href=\"https:\/\/bitcoinmagazine.com\/\">Bitcoin Magazine<\/a><br \/>\n<img decoding=\"async\" src=\"https:\/\/bitcoinmagazine.com\/wp-content\/uploads\/2026\/07\/Coldcard-Wallet-Flaw-Exposes-Years-of-Bitcoin-Seeds.jpg\" \/><br \/>\n<a rel=\"nofollow\" href=\"https:\/\/bitcoinmagazine.com\/news\/coldcard-wallet-exposed-after-bitcoin-hack\">Coldcard Wallet Flaw Exposes Years of Bitcoin Seeds After $70M in BTC Stolen<\/a><\/p>\n<div><\/div>\n<p class=\"wp-block-paragraph\">The popular Bitcoin hardware wallet Coldcard product, made by Coinkite, is at risk following a $70 million hack.<\/p>\n<p class=\"wp-block-paragraph\">Coinkite on Thursday admitted that its Coldcard Mk3 model was affected following the hack and advised users to move their funds. Then, on Friday, the company <a href=\"https:\/\/blog.coinkite.com\/entropy-technical-backgrounder\/\" target=\"_blank\" rel=\"noopener\">said<\/a> that users of the later hardware devices Mk4, Mk5, and Q should also take precautions.\u00a0<\/p>\n<p class=\"wp-block-paragraph\">Hackers on Thursday were first able to drain funds from 1,196 Bitcoin addresses because their private keys were not generated using sufficient entropy \u2014 or randomness.\u00a0<\/p>\n<p class=\"wp-block-paragraph\">Since then, a total of 1,082.65 Bitcoins have disappeared from wallets, <a href=\"https:\/\/x.com\/glxyresearch\/status\/2083181683067506899\">according<\/a> to data from Galaxy Research and engineers at payments company Block.\u00a0<\/p>\n<p class=\"wp-block-paragraph\">While Coinkite has not admitted that the hack is linked to their wallets, the company has said that a wallet seed generation bug in Coldcard products meant the hardware\u2019s true random number generator wasn\u2019t actually being used on certain firmware versions.\u00a0<\/p>\n<p class=\"wp-block-paragraph\">Coinkite and other engineers in the Bitcoin space are still investigating reportedly ongoing drains still happening at the time of writing.<\/p>\n<h2 class=\"wp-block-heading\">What actually happened\u00a0<\/h2>\n<p class=\"wp-block-paragraph\">A firmware bug in Coldcard Mk3 devices (starting with version 4.0.1 in March 2021) caused seed generation to fall back to a weak software PRNG instead of the hardware true random number generator, producing seeds with only ~40 bits of entropy rather than the intended 128.\u00a0 This made private keys for many single-signature wallets (especially those created without dice rolls or a strong BIP-39 passphrase) predictable enough for attackers to brute-force.<\/p>\n<p class=\"wp-block-paragraph\">A total of 594.5 Bitcoins worth over $35.7 million at today\u2019s prices were moved to a new <a href=\"https:\/\/mempool.space\/address\/bc1qq85v2c926eg6pgxhwp6q7lf6cnsz80qs3fcu9r\" target=\"_blank\" rel=\"noopener\">address<\/a> from single-signature addresses on Thursday.\u00a0<\/p>\n<figure class=\"wp-block-embed is-type-rich is-provider-x wp-block-embed-x\">\n<div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"twitter-tweet\" data-width=\"550\" data-dnt=\"true\">\n<p lang=\"en\" dir=\"ltr\"><img decoding=\"async\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/17.0.2\/72x72\/1f6a8.png\" alt=\"\ud83d\udea8\" class=\"wp-smiley\" \/> NEW: Over 594 BTC worth $38 million was stolen from Bitcoin hardware wallet Coldcard users.<\/p>\n<p>The attacker then moved around the BTC and consolidated 562 BTC into this address below. <\/p>\n<p>Users are urged to review the company&#8217;s official security guidance as soon as possible. <img decoding=\"async\" src=\"https:\/\/s.w.org\/images\/core\/emoji\/17.0.2\/72x72\/203c.png\" alt=\"\u203c\" class=\"wp-smiley\" \/> <a href=\"https:\/\/t.co\/exD2Wax7CY\">pic.twitter.com\/exD2Wax7CY<\/a><\/p>\n<p>\u2014 Bitcoin Magazine (@BitcoinMagazine) <a href=\"https:\/\/x.com\/BitcoinMagazine\/status\/2083155812608798827?ref_src=twsrc%5Etfw\">July 31, 2026<\/a><\/p><\/blockquote>\n<\/div>\n<\/figure>\n<p class=\"wp-block-paragraph\">More wallets were later drained, according to blockchain analysts, with the total now over $70 million.\u00a0<\/p>\n<p class=\"wp-block-paragraph\">Various affected users shared their experiences on social media, with one <a href=\"https:\/\/www.reddit.com\/r\/Bitcoin\/comments\/1vatgl4\/full_panic_one_of_my_wallets_was_drained\/\" target=\"_blank\" rel=\"noopener\">saying<\/a> that their Bitcoin had not been moved since 2021, and all of a sudden was swiped.\u00a0<\/p>\n<p class=\"wp-block-paragraph\">Bitcoin engineers have since <a href=\"https:\/\/x.com\/jamesob\/status\/2082946043696574756\">said<\/a> that Coldcard products \u2014 specifically the Mk3 models \u2014 had\u00a0 \u201cfaulty entropy in wallet generation,\u201d meaning they did not use real randomness to create a seedphrase.\u00a0<\/p>\n<h2 class=\"wp-block-heading\">What to do\u00a0<\/h2>\n<p class=\"wp-block-paragraph\">Developers in the Bitcoin space have since urged users to move their funds if they used a Coldcard. Coldcard has issued guidance for users to take, which can be found <a href=\"https:\/\/blog.coinkite.com\/entropy-technical-backgrounder\/\" target=\"_blank\" rel=\"noopener\">here<\/a>.<\/p>\n<figure class=\"wp-block-embed is-type-rich is-provider-x wp-block-embed-x\">\n<div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"twitter-tweet\" data-width=\"550\" data-dnt=\"true\">\n<p lang=\"en\" dir=\"ltr\">The first post was the advisory and what users should  do.<\/p>\n<p>This second post has the technical details: what actually went wrong, why our reviews missed it, the impact across Mk3\/Mk4\/Q\/Mk5, and what we changed.<a href=\"https:\/\/t.co\/HshUxevCl3\">https:\/\/t.co\/HshUxevCl3<\/a><\/p>\n<p>( current evaluating Mk3 firmware release ) <a href=\"https:\/\/t.co\/Yfdx4XcztA\">https:\/\/t.co\/Yfdx4XcztA<\/a><\/p>\n<p>\u2014 COLDCARD (@COLDCARDwallet) <a href=\"https:\/\/x.com\/COLDCARDwallet\/status\/2083081854597374168?ref_src=twsrc%5Etfw\">July 31, 2026<\/a><\/p><\/blockquote>\n<\/div>\n<\/figure>\n<p class=\"wp-block-paragraph\">Coinkite first said that their Mk3 models were affected but then on Friday said that those who did not use sufficient entropy to create a seed \u2014 in this case, 50 dice rolls \u2014 should generate a brand-new seed on the updated device. Others have warned to ditch Coldcard completely to be sure their funds are safe.\u00a0<\/p>\n<p class=\"wp-block-paragraph\">\u201cEverything is fucked,\u201d wrote Kevin Loaec, CEO of Bitcoin security company, Wizardsardine.\u00a0<\/p>\n<p class=\"wp-block-paragraph\">\u201cEvery single mnemonic generated [via a Coldcard] since 2021 will be public in the next few days,\u201d Loaec warns.<\/p>\n<p>This post <a rel=\"nofollow\" href=\"https:\/\/bitcoinmagazine.com\/news\/coldcard-wallet-exposed-after-bitcoin-hack\">Coldcard Wallet Flaw Exposes Years of Bitcoin Seeds After $70M in BTC Stolen<\/a> first appeared on <a rel=\"nofollow\" href=\"https:\/\/bitcoinmagazine.com\/\">Bitcoin Magazine<\/a> and is written by <a rel=\"nofollow\" href=\"https:\/\/bitcoinmagazine.com\/authors\/mathewdisalvo\">Mathew Di Salvo<\/a>.<\/p>","protected":false},"excerpt":{"rendered":"<p>Bitcoin Magazine Coldcard Wallet Flaw Exposes Years of Bitcoin Seeds After $70M in BTC Stolen The popular Bitcoin hardware wallet Coldcard product, made by Coinkite, is at risk following a $70 million hack. Coinkite on Thursday admitted that its Coldcard Mk3 model was affected following the hack and advised users to move their funds. Then, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":51233,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-51231","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-feeds"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Coldcard Wallet Flaw Exposes Years of Bitcoin Seeds After $70M in BTC Stolen - cryptd.in<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/cryptd.in\/hu\/coldcard-wallet-flaw-exposes-years-of-bitcoin-seeds-after-70m-in-btc-stolen\/\" \/>\n<meta property=\"og:locale\" content=\"hu_HU\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Coldcard Wallet Flaw Exposes Years of Bitcoin Seeds After $70M in BTC Stolen - cryptd.in\" \/>\n<meta property=\"og:description\" content=\"Bitcoin Magazine Coldcard Wallet Flaw Exposes Years of Bitcoin Seeds After $70M in BTC Stolen The popular Bitcoin hardware wallet Coldcard product, made by Coinkite, is at risk following a $70 million hack. Coinkite on Thursday admitted that its Coldcard Mk3 model was affected following the hack and advised users to move their funds. 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Coinkite on Thursday admitted that its Coldcard Mk3 model was affected following the hack and advised users to move their funds. 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